This feature allows Presenters and broadcasters to preview what they are sharing

Curious to see how your screen appears for other meeting Participants? If you would like to preview what they see when you share your screen, simply click the blue Click here" link that appears on your screen.

Note: you'll experience an "infinite mirror effect" when previewing an application window or full desktop screen shares. Don't be alarmed. This effect is just an artifact used to share a screen back to yourself - like standing between opposing mirrors.